The paper factory Smurfit C.D. Haupt in Wrexen has rebuilt its water treatment plant. In terms of quality control and sustainability of the water treatment, the plant was expanded. The basic and detailed engineering was performed by VIRO, while Smurfit Kappa Paper Production Technology and Smurfit Kappa CD offered their process-technological knowledge. In January 2010, an inventory of the existing facility was made and afterwards we started with the basic engineering. This includes both the process and instrumentation diagram and the layout of the water treatment plant. In this phase, the long-term delivery device was determined and was ordered according to the specification. In the following detailed engineering phase, all necessary drawings and specifications had been created, to deliver a “design basis” package to the departments of Construction & Architecture and Piping & Equipment Engineering. With this package of detailed engineering the responsible project manager of Smurfit Kappa CD, Mr. M. Jaschke, was able to realize his procurement and the placing of orders. He also was able to issue specific instructions during the execution phase of the commissioned contractors at any time. At the end of 2010 the new water treatment with the satisfaction of all parties involved was put into operation.